Step 3: Add to Cart*

If you’re looking for natural performance, easy layering and a whole lot of comfort, then look no further as the Altitude Zip is one seriously good thermal layer. Whether you’re wearing it as a base/first layer, on its own, 3/4 zip up or down, it’s perfect for anyone who’s on the go, especially if you’re expecting to hit a range of temperatures while you’re at it. The high collar, when zipped up, also offers an extra level of warmth beyond the Crew Neck version of this top.

Made with our flagship Enigma MicroMerino® fabric – 96% superfine Australian Merino and 4% Elastane, the Altitude Zip features all of the performance you know and love in our MicroMerino® garments, plus an easy four way stretch for freedom of movement when you’re on the go. Oh, and did we mention the incredibly soft next to skin feel?

With flat lock seams, heat transferred tags and raglan sleeves to help prevent chafing, plus thumb loops and a drop back hem for easy layering, the Altitude Zip is the perfect combination of performance, warmth and comfort.

Designed to be worn as a snug ‘contact fit’ layer, we’d recommend going up a size if you’re looking for a more casual fit.

Key Features:

Made with the flagship Enigma MicroMerino® - 96% superfine Australian Merino and 4% Elastane - for an easy four way stretch and freedom of movement.

3/4 zip to maximize temperature regulation – Zip down when the temperature rises and zip up when it drops.

Drop back hem designed for tucking into your outer layers, or sitting over bottom layers, with no exposed cold spots when you're on the go.

The combination of merino wool and 4% elastin in the 'Enigma' fabric ensure perfect body contact, eliminates excessive bulk, and a 4-way stretch allowing your limbs to move freely as the fabric does not inhibit your range of motion.

Antimicrobial - Moisture absorption properties reduce the tendencies for a build-up of odour.

Luxuriously soft next to skin

Breathable and temperature regulating

Ultra-comfortable warmth

Maximum warmth, minimal weight

Quick drying

All ioMerino fabrics are fully machine-washable.

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Full Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

My "go to"

Review by Bruce on 2/14/18

This is my go-to Rogaining top - good for layering and very comfortable!

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Full Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

Great Kit

Review by Olly on 10/13/17

Perfect thermal layer. Merino is simply the best material, and this one adds style and comfort too. My old synthetic thermals are getting biffed.

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Full Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

Awesome

Review by Action Man on 10/13/17

When my paddle turned into an "adventure" and I was still going in the dark in torrential rain with no jacket on - this thermal saved me from hypothermia - and it was really comfortable to paddle in - thanks!

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Full Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

Super comfy and super versatile

Review by Sputnik on 10/13/17

When it’s slightly milder I’ll go the Altitude T, but during Winter I’m a bit soft so will take the warmth of having a sleeve.The thumb loops help keep my hands warm if I’m going sans-gloves, and although the crew version of this top is awesome, I love being able to zip up or zip down as I get warmer or cooler. (I’ll also whack this one in my pack and pop it on over an Altitude T if it gets colder when I’m out and about.)

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Full Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

wowza

Review by R on 10/13/17

Your model is hot!!

Comfort

Full Star

Full Star

Full Star

Full Star

Full Star

Value

Full Star

Full Star

Full Star

Full Star

Empty Star

Quality

Full Star

Full Star

Full Star

Full Star

Full Star

Awesome Baselayer

Review by BudD on 10/13/17

I had my first opportunity to wear my new Altitude this morning as we are at the beginning of a cold front in Florida. It was 40 degrees with a slight breeze when I started my 6 1/2 mile walk and wore a light fleece. By 3 miles I zipped open my fleece because I was toasty warm at the 5 mile mark I removed the fleece and zipped the Altitude down 1/2 way. I am completely satisfied with the Altitude and look forward to wearing it in April during an AT hike. I purchased the XXL which fits great for my size (48” chest, 55” girth and 42” waist). In addition to the great product, I had an opportunity to speak with Danella in customer service and she was a tremendous help.

Comfort

Full Star

Full Star

Full Star

Full Star

Empty Star

Value

Full Star

Full Star

Full Star

Full Star

Empty Star

Quality

Full Star

Full Star

Full Star

Empty Star

Empty Star

Zip failure

Review by Gibbo on 5/16/17

I had a manufacturing issue with the zip, this was easily exchanged and I am very happy with the customer service I have received to replace the item.